ABO AMERICAN BOARD OF OPTICIANRY BASIC CERTIFICATION EXAM Final
Comprehensive Review | 200 Questions and Answers with Detailed
Explanations
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ABOUT THIS EXAM
The American Board of Opticianry (ABO) Basic Certification Exam tests the knowledge and skills
required for entry-level opticians. This comprehensive review covers all major content areas
including optics, lensometry, ophthalmic lenses, dispensing, and ANSI standards.
Exam Structure:
- Total Practice Questions: 200
- Format: Multiple Choice
- Content Areas: Ophthalmic Optics, Lensometry, Ophthalmic Lenses, Dispensing, Frames, ANSI
Standards, Ocular Anatomy, and Professional Ethics
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SECTION 1: OPHTHALMIC OPTICS
Questions 1-30
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QUESTION 1
What is the refractive index of a material?
,A. The ratio of the speed of light in a vacuum to the speed of light in the material
B. The angle at which light bends when entering a lens
C. The thickness of the lens
D. The curvature of the lens surface
CORRECT ANSWER: A
RATIONALE: The refractive index (n) is the ratio of the speed of light in a vacuum to the speed of
light in the material. It determines how much light bends when entering the material.
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QUESTION 2
What is the refractive index of crown glass?
A. 1.523
B. 1.586
C. 1.498
D. 1.600
CORRECT ANSWER: A
RATIONALE: Crown glass has a refractive index of approximately 1.523. This is the standard
reference material for ophthalmic lenses. Higher index materials bend light more.
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,QUESTION 3
What is the refractive index of CR-39 plastic?
A. 1.523
B. 1.498
C. 1.586
D. 1.670
CORRECT ANSWER: B
RATIONALE: CR-39 plastic (allyl diglycol carbonate) has a refractive index of approximately
1.498. It is lighter than glass and has good optical properties.
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QUESTION 4
What is the refractive index of polycarbonate?
A. 1.498
B. 1.523
C. 1.586
D. 1.670
CORRECT ANSWER: C
, RATIONALE: Polycarbonate has a refractive index of approximately 1.586. It is impact-resistant
and lightweight, making it ideal for safety eyewear and children's glasses.
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QUESTION 5
What is the refractive index of high-index 1.67 material?
A. 1.523
B. 1.586
C. 1.670
D. 1.740
CORRECT ANSWER: C
RATIONALE: High-index 1.67 material has a refractive index of 1.670. Higher index materials
allow for thinner, lighter lenses, especially for higher prescriptions.
---
QUESTION 6
What is the Abbe value (V-number)?
A. A measure of a material's dispersion (chromatic aberration)
B. A measure of refractive index
C. A measure of lens thickness
D. A measure of impact resistance
Comprehensive Review | 200 Questions and Answers with Detailed
Explanations
---
ABOUT THIS EXAM
The American Board of Opticianry (ABO) Basic Certification Exam tests the knowledge and skills
required for entry-level opticians. This comprehensive review covers all major content areas
including optics, lensometry, ophthalmic lenses, dispensing, and ANSI standards.
Exam Structure:
- Total Practice Questions: 200
- Format: Multiple Choice
- Content Areas: Ophthalmic Optics, Lensometry, Ophthalmic Lenses, Dispensing, Frames, ANSI
Standards, Ocular Anatomy, and Professional Ethics
---
SECTION 1: OPHTHALMIC OPTICS
Questions 1-30
---
QUESTION 1
What is the refractive index of a material?
,A. The ratio of the speed of light in a vacuum to the speed of light in the material
B. The angle at which light bends when entering a lens
C. The thickness of the lens
D. The curvature of the lens surface
CORRECT ANSWER: A
RATIONALE: The refractive index (n) is the ratio of the speed of light in a vacuum to the speed of
light in the material. It determines how much light bends when entering the material.
---
QUESTION 2
What is the refractive index of crown glass?
A. 1.523
B. 1.586
C. 1.498
D. 1.600
CORRECT ANSWER: A
RATIONALE: Crown glass has a refractive index of approximately 1.523. This is the standard
reference material for ophthalmic lenses. Higher index materials bend light more.
---
,QUESTION 3
What is the refractive index of CR-39 plastic?
A. 1.523
B. 1.498
C. 1.586
D. 1.670
CORRECT ANSWER: B
RATIONALE: CR-39 plastic (allyl diglycol carbonate) has a refractive index of approximately
1.498. It is lighter than glass and has good optical properties.
---
QUESTION 4
What is the refractive index of polycarbonate?
A. 1.498
B. 1.523
C. 1.586
D. 1.670
CORRECT ANSWER: C
, RATIONALE: Polycarbonate has a refractive index of approximately 1.586. It is impact-resistant
and lightweight, making it ideal for safety eyewear and children's glasses.
---
QUESTION 5
What is the refractive index of high-index 1.67 material?
A. 1.523
B. 1.586
C. 1.670
D. 1.740
CORRECT ANSWER: C
RATIONALE: High-index 1.67 material has a refractive index of 1.670. Higher index materials
allow for thinner, lighter lenses, especially for higher prescriptions.
---
QUESTION 6
What is the Abbe value (V-number)?
A. A measure of a material's dispersion (chromatic aberration)
B. A measure of refractive index
C. A measure of lens thickness
D. A measure of impact resistance
